fix: 누락된 필드 변경 추가

Author: MU-Software

app/admin_api/serializers/event/sponsor.py

@@ -14,4 +14,4 @@ class Meta:
 class SponsorAdminSerializer(BaseAbstractSerializer, JsonSchemaSerializer, serializers.ModelSerializer):
     class Meta:
         model = Sponsor
-        fields = COMMON_ADMIN_FIELDS + ("event", "logo", "page", "name_ko", "name_en")
+        fields = COMMON_ADMIN_FIELDS + ("event", "logo", "sitemap", "name_ko", "name_en")